Ascii Hex convert in bash

Question

I m now doing it this way    root     echo Aa hexdump -v 0000000 6141 000a                               0000003  root     echo -e   x41 x41 x41 x41  AAAA   But it s not exactly behaving as I wanted   the hex form of Aa should be 4161 but the output is 6141 000a which seems not making sense   and when performing hex to ascii is there another utility so that I don t need the prefix  x

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Finally got the correct thing  echo  Hello  world     tr -d   n    xxd -ps -c 200

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Text2Conv  Aa  for letter in   echo   Text2Conv    sed  s         1  g   do printf   x    letter  done   4161  The trick is using sed to parse the Text2Conv to format we can then seperate anf loop using for

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The reason is because hexdump by default prints out 16-bit integers  not bytes  If your system has them  hd  or hexdump -C  or xxd will provide less surprising outputs - if not  od -t x1 is a POSIX-standard way to get byte-by-byte hex output  You can use od -t x1c to show both the byte hex values and the corresponding letters   If you have xxd  which ships with vim   you can use xxd -r to convert back from hex  from the same format xxd produces   If you just have plain hex  just the  4161   which is produced by xxd -p  you can use xxd -r -p to convert back

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echo append a carriage return at the end   Use  echo -e   to remove the extra 0x0A  Also  hexdump does not work byte-per-byte as default  This is why it shows you bytes in a weird endianess and why it shows you an extra 0x00

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SteinAir s answer above was helpful to me -- thank you  And below is a way it inspired  to convert hex strings to ascii    for h in   echo  4161    sed  s         1  g    do printf  echo   x h   done Aa

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gt  printf   x x n    A    a  4161

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For the first part  try  echo Aa   od -t x1   It prints byte-by-byte    echo Aa   od -t x1 0000000 41 61 0a 0000003   The 0a is the implicit newline that echo produces   Use echo -n or printf instead     printf Aa   od -t x1 0000000 41 61 0000002

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echo -n Aa   hexdump -e   1   02x    echo

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I use    gt  echo Aa   tr -d   n    xxd -p 4161   gt  echo 414161   tr -d   n    xxd -r -p AAa   The tr -d   n  will trim any possible newlines in your input

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jcomeau aspire    echo -n The quick brown fox jumps over the lazy dog   python -c  print raw input   encode  hex     54686520717569636b2062726f776e20666f78206a756d7073206f76657220746865206c617a7920646f67 jcomeau aspire    echo -n The quick brown fox jumps over the lazy dog   python -c  print raw input   encode  hex       python -c  print raw input   decode  hex     The quick brown fox jumps over the lazy dog   it could be done with Python3 as well  but differently  and I m a lazy dog

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With bash    a abcdefghij     for   i 0 i lt    a  i     do printf  02X     a  i 1  done   6162636465666768696A

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I don t know how it crazy it looks but it does the job really well  ascii2hex    a      s 0000000 printf   a    hexdump   grep    s   sed s      g  sed s   s       Created this when I was trying to see my name in HEX    use how can you use it

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here a little script I wrote to convert ascii to hex  hope it helps    echo  0x   echo  ASCII INPUT GOES HERE    hexdump -vC    awk  BEGIN  IFS   t     1     print      awk   sub            1     tr -d   n    tr -d         rev   cut -c 3-   rev

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according to http   mylinuxbook com hexdump  you might use the hexdump format parameter  echo Aa   hexdump -C -e   1   02X     will return 4161  to add an extra linefeed at the end  append another formatter   BUT  the format given above will give multiplier outputs for repetitive characters    printf  Hello    hexdump -e   1   02X    48656C  6F   instead of   48656c6c6f

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For single line solution   echo  Hello World    xxd -ps -c 200   tr -d   n    It will print   48656c6c6f20576f726c640a   or for files   cat  path to file   xxd -ps -c 200   tr -d   n    For reverse operation   echo  48656c6c6f20576f726c640a    xxd -ps -r   It will print   Hello World

[bash] Ascii/Hex convert in bash

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